To disable SFC completely, follow the guide here: http://www.MSFN.org/unattended/xp/wfp.htm 'SFCDisable' never works, as Windows Setup will attempt to restore the key back to 'enabled' at the 8min stage. Setup doesn't know 'SFCSetting' so it won't touch it at all. As for DirectX 9.0b, I had that problem once, it didn't appear when I ran setup again. The ISO was never modified at that time.